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Thermoelectric properties of Yb-filled CoSb3 skutterudites

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Abstract

Yb-filled skutterudites Yb z Co4Sb12 (z = 0, 0.1, 0.2, 0.3, 0.4) were prepared by encapsulated melting and hot pressing. The filling effects of Yb on the transport and the thermoelectric properties of the skutterudites were examined. In the case of z ≥ 0.3, a secondary phase (YbSb2) was formed, indicating that the filling fraction limit of Yb was z = 0.2 − 0.3. The intrinsic CoSb3 had a high positive Seebeck coefficient, but Yb-filled CoSb3 exhibited a negative Seebeck coefficient. In the case of z ≤ 0.1, the maximum absolute value of the Seebeck coefficient was | −231| μVK−1, and in the case of z ≥ 0.2, the absolute value of the Seebeck coefficient increased with increasing temperature. The electrical conductivity increased and the Seebeck coefficient decreased with increasing Yb filling content due to the increased carrier concentration. The thermal conductivity was reduced significantly by Yb filling, mainly due to a decrease in the lattice thermal conductivity. Also, the lattice thermal conductivity decreased with increasing Yb filling content, indicating that the phonon scattering was caused by the rattling of Yb fillers in the voids of the skutterudite structure. Yb0.2Co4Sb12 showed the highest figure of merit of 1.0 at 823 K.

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Authors and Affiliations

  1. Energy and Environmental Materials Division, Korea Institute of Ceramic Engineering and Technology, Seoul, 153-801, Korea

    Kwan-Ho Park & Won-Seon Seo

  2. Department of Materials Science and Engineering, Korea National University of Transportation, Chungju, 380-702, Korea

    Dong-Kil Shin & Il-Ho Kim

Authors
  1. Kwan-Ho Park
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  2. Won-Seon Seo
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  3. Dong-Kil Shin
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  4. Il-Ho Kim
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Correspondence to Il-Ho Kim.

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Park, KH., Seo, WS., Shin, DK. et al. Thermoelectric properties of Yb-filled CoSb3 skutterudites. Journal of the Korean Physical Society 65, 491–495 (2014). https://doi.org/10.3938/jkps.65.491

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  • DOI: https://doi.org/10.3938/jkps.65.491

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